/*
 * Copyright Patrick Powell 1995
 * This code is based on code written by Patrick Powell (papowell@astart.com)
 * It may be used for any purpose as long as this notice remains intact
 * on all source code distributions
 */

/**************************************************************
 * Original:
 * Patrick Powell Tue Apr 11 09:48:21 PDT 1995
 * A bombproof version of doprnt (dopr) included.
 * Sigh.  This sort of thing is always nasty do deal with.  Note that
 * the version here does not include floating point...
 *
 * snprintf() is used instead of sprintf() as it does limit checks
 * for string length.  This covers a nasty loophole.
 *
 * The other functions are there to prevent NULL pointers from
 * causing nast effects.
 *
 * More Recently:
 *  Brandon Long <blong@fiction.net> 9/15/96 for mutt 0.43
 *  This was ugly.  It is still ugly.  I opted out of floating point
 *  numbers, but the formatter understands just about everything
 *  from the normal C string format, at least as far as I can tell from
 *  the Solaris 2.5 printf(3S) man page.
 *
 *  Brandon Long <blong@fiction.net> 10/22/97 for mutt 0.87.1
 *    Ok, added some minimal floating point support, which means this
 *    probably requires libm on most operating systems.  Don't yet
 *    support the exponent (e,E) and sigfig (g,G).  Also, fmtint()
 *    was pretty badly broken, it just wasn't being exercised in ways
 *    which showed it, so that's been fixed.  Also, formated the code
 *    to mutt conventions, and removed dead code left over from the
 *    original.  Also, there is now a builtin-test, just compile with:
 *           gcc -DTEST_SNPRINTF -o snprintf snprintf.c -lm
 *    and run snprintf for results.
 *
 *  Thomas Roessler <roessler@guug.de> 01/27/98 for mutt 0.89i
 *    The PGP code was using unsigned hexadecimal formats.
 *    Unfortunately, unsigned formats simply didn't work.
 *
 *  Michael Elkins <me@cs.hmc.edu> 03/05/98 for mutt 0.90.8
 *    The original code assumed that both snprintf() and vsnprintf() were
 *    missing.  Some systems only have snprintf() but not vsnprintf(), so
 *    the code is now broken down under HAVE_SNPRINTF and HAVE_VSNPRINTF.
 *
 *  Andrew Tridgell (tridge@samba.org) Oct 1998
 *    fixed handling of %.0f
 *    added test for HAVE_LONG_DOUBLE
 *
 **************************************************************/


#if !defined(HAVE_SNPRINTF) || !defined(HAVE_VSNPRINTF)

#include <string.h>
#include <ctype.h>
#include <sys/types.h>

/* Define this as a fall through, HAVE_STDARG_H is probably already set */

#define HAVE_STDARG_H
#define HAVE_SNPRINTF

/* varargs declarations: */

#if defined(HAVE_STDARG_H)
# include <stdarg.h>
# define HAVE_STDARGS    /* let's hope that works everywhere (mj) */
# define VA_LOCAL_DECL   va_list ap
# define VA_START(f)     va_start(ap, f)
# define VA_SHIFT(v,t)  ;   /* no-op for ANSI */
# define VA_END          va_end(ap)
#else
# if defined(HAVE_VARARGS_H)
#  include <varargs.h>
#  undef HAVE_STDARGS
#  define VA_LOCAL_DECL   va_list ap
#  define VA_START(f)     va_start(ap)      /* f is ignored! */
#  define VA_SHIFT(v,t) v = va_arg(ap,t)
#  define VA_END        va_end(ap)
# else
/*XX ** NO VARARGS ** XX*/
# endif
#endif

#ifdef HAVE_LONG_DOUBLE
#define LDOUBLE long double
#else
#define LDOUBLE double
#endif

int snprintf (char *str, size_t count, const char *fmt, ...);
int vsnprintf (char *str, size_t count, const char *fmt, va_list arg);

static void dopr (char *buffer, size_t maxlen, const char *format,
                  va_list args);
static void fmtstr (char *buffer, size_t *currlen, size_t maxlen,
            char *value, int flags, int min, int max);
static void fmtint (char *buffer, size_t *currlen, size_t maxlen,
            long value, int base, int min, int max, int flags);

static void dopr_outch (char *buffer, size_t *currlen, size_t maxlen, char c );

/*
 * dopr(): poor man's version of doprintf
 */

/* format read states */
#define DP_S_DEFAULT 0
#define DP_S_FLAGS   1
#define DP_S_MIN     2
#define DP_S_DOT     3
#define DP_S_MAX     4
#define DP_S_MOD     5
#define DP_S_CONV    6
#define DP_S_DONE    7

/* format flags - Bits */
#define DP_F_MINUS  (1 << 0)
#define DP_F_PLUS   (1 << 1)
#define DP_F_SPACE  (1 << 2)
#define DP_F_NUM    (1 << 3)
#define DP_F_ZERO   (1 << 4)
#define DP_F_UP     (1 << 5)
#define DP_F_UNSIGNED   (1 << 6)

/* Conversion Flags */
#define DP_C_SHORT   1
#define DP_C_LONG    2
#define DP_C_LDOUBLE 3

#define char_to_int(p) (p - '0')
#define MAX(p,q) ((p >= q) ? p : q)

static void dopr (char *buffer, size_t maxlen, const char *format, va_list args) {
    char ch;
    long value;
    char *strvalue;
    int min;
    int max;
    int state;
    int flags;
    int cflags;
    size_t currlen;

    state = DP_S_DEFAULT;
    currlen = flags = cflags = min = 0;
    max = -1;
    ch = *format++;

    while (state != DP_S_DONE) {
        if ((ch == '\0') || (currlen >= maxlen)) {
            state = DP_S_DONE;
        }

        switch(state) {
            case DP_S_DEFAULT:
                if (ch == '%')
                    state = DP_S_FLAGS;
                else
                    dopr_outch (buffer, &currlen, maxlen, ch);
                ch = *format++;
                break;
            case DP_S_FLAGS:
                switch (ch) {
                    case '-':
                        flags |= DP_F_MINUS;
                        ch = *format++;
                        break;
                    case '+':
                        flags |= DP_F_PLUS;
                        ch = *format++;
                        break;
                    case ' ':
                        flags |= DP_F_SPACE;
                        ch = *format++;
                        break;
                    case '#':
                        flags |= DP_F_NUM;
                        ch = *format++;
                        break;
                    case '0':
                        flags |= DP_F_ZERO;
                        ch = *format++;
                        break;
                    default:
                        state = DP_S_MIN;
                        break;
                }
                break;
            case DP_S_MIN:
                if (isdigit(ch)) {
                    min = 10*min + char_to_int (ch);
                    ch = *format++;
                } else if (ch == '*') {
                    min = va_arg (args, int);
                    ch = *format++;
                    state = DP_S_DOT;
                } else {
                    state = DP_S_DOT;
                }
                break;
            case DP_S_DOT:
                if (ch == '.') {
                    state = DP_S_MAX;
                    ch = *format++;
                } else {
                    state = DP_S_MOD;
                }
                break;
            case DP_S_MAX:
                if (isdigit(ch)) {
                    if (max < 0) {
                        max = 0;
                    }
                    max = 10*max + char_to_int (ch);
                    ch = *format++;
                } else if (ch == '*') {
                    max = va_arg (args, int);
                    ch = *format++;
                    state = DP_S_MOD;
                } else {
                    state = DP_S_MOD;
                }
                break;
            case DP_S_MOD:
                /* Currently, we don't support Long Long, bummer */
                switch (ch) {
                    case 'h':
                        cflags = DP_C_SHORT;
                        ch = *format++;
                        break;
                    case 'l':
                        cflags = DP_C_LONG;
                        ch = *format++;
                        break;
                    case 'L':
                        cflags = DP_C_LDOUBLE;
                        ch = *format++;
                        break;
                    default:
                        break;
                }
                state = DP_S_CONV;
                break;
            case DP_S_CONV:
                switch (ch) {
                    case 'd':
                    case 'i':
                        if (cflags == DP_C_SHORT) {
                            value = va_arg (args, int);
                        } else if (cflags == DP_C_LONG) {
                            value = va_arg (args, long int);
                        } else {
                            value = va_arg (args, int);
                        }
                        fmtint (buffer, &currlen, maxlen, value, 10, min, max, flags);
                        break;
                    case 'o':
                        flags |= DP_F_UNSIGNED;
                        if (cflags == DP_C_SHORT) {
                            value = va_arg (args, unsigned int);
                        } else if (cflags == DP_C_LONG) {
                            value = va_arg (args, unsigned long int);
                        } else {
                            value = va_arg (args, unsigned int);
                        }
                        fmtint (buffer, &currlen, maxlen, value, 8, min, max, flags);
                        break;
                    case 'u':
                        flags |= DP_F_UNSIGNED;
                        if (cflags == DP_C_SHORT) {
                            value = va_arg (args, unsigned int);
                        } else if (cflags == DP_C_LONG) {
                            value = va_arg (args, unsigned long int);
                        } else {
                            value = va_arg (args, unsigned int);
                        }
                        fmtint (buffer, &currlen, maxlen, value, 10, min, max, flags);
                        break;
                    case 'X':
                        flags |= DP_F_UP;
                    case 'x':
                        flags |= DP_F_UNSIGNED;
                        if (cflags == DP_C_SHORT) {
                            value = va_arg (args, unsigned int);
                        } else if (cflags == DP_C_LONG) {
                            value = va_arg (args, unsigned long int);
                        } else {
                            value = va_arg (args, unsigned int);
                        }
                        fmtint (buffer, &currlen, maxlen, value, 16, min, max, flags);
                        break;
                    case 'c':
                        dopr_outch (buffer, &currlen, maxlen, va_arg (args, int));
                        break;
                    case 's':
                        strvalue = va_arg (args, char *);
                        if (max < 0) {
                            max = maxlen; /* ie, no max */
                        }
                        fmtstr (buffer, &currlen, maxlen, strvalue, flags, min, max);
                        break;
                    case 'p':
                        strvalue = va_arg (args, void *);
                        fmtint (buffer, &currlen, maxlen, (long) strvalue, 16, min, max, flags);
                        break;
                    case 'n':
                        if (cflags == DP_C_SHORT) {
                            short int *num;
                            num = va_arg (args, short int *);
                            *num = currlen;
                        } else if (cflags == DP_C_LONG) {
                            long int *num;
                            num = va_arg (args, long int *);
                            *num = currlen;
                        } else {
                            int *num;
                            num = va_arg (args, int *);
                            *num = currlen;
                        }
                        break;
                    case '%':
                        dopr_outch (buffer, &currlen, maxlen, ch);
                        break;
                    case 'w':
                        /* not supported yet, treat as next char */
                        ch = *format++;
                        break;
                    default:
                        /* Unknown, skip */
                        break;
                }
                ch = *format++;
                state = DP_S_DEFAULT;
                flags = cflags = min = 0;
                max = -1;
                break;
            case DP_S_DONE:
                break;
            default:
                /* hmm? */
                break; /* some picky compilers need this */
        }
    }
    if (currlen < maxlen - 1) {
        buffer[currlen] = '\0';
    } else {
        buffer[maxlen - 1] = '\0';
    }
}

static void fmtstr (char *buffer, size_t *currlen, size_t maxlen,
            char *value, int flags, int min, int max)
{
  int padlen, strln;     /* amount to pad */
  int cnt = 0;

  if (value == 0)
  {
    value = "<NULL>";
  }

  for (strln = 0; value[strln]; ++strln); /* strlen */
  padlen = min - strln;
  if (padlen < 0)
    padlen = 0;
  if (flags & DP_F_MINUS)
    padlen = -padlen; /* Left Justify */

  while ((padlen > 0) && (cnt < max))
  {
    dopr_outch (buffer, currlen, maxlen, ' ');
    --padlen;
    ++cnt;
  }
  while (*value && (cnt < max))
  {
    dopr_outch (buffer, currlen, maxlen, *value++);
    ++cnt;
  }
  while ((padlen < 0) && (cnt < max))
  {
    dopr_outch (buffer, currlen, maxlen, ' ');
    ++padlen;
    ++cnt;
  }
}

/* Have to handle DP_F_NUM (ie 0x and 0 alternates) */

static void fmtint (char *buffer, size_t *currlen, size_t maxlen,
            long value, int base, int min, int max, int flags)
{
  int signvalue = 0;
  unsigned long uvalue;
  char convert[20];
  int place = 0;
  int spadlen = 0; /* amount to space pad */
  int zpadlen = 0; /* amount to zero pad */
  int caps = 0;

  if (max < 0)
    max = 0;

  uvalue = value;

  if(!(flags & DP_F_UNSIGNED))
  {
    if( value < 0 ) {
      signvalue = '-';
      uvalue = -value;
    }
    else
      if (flags & DP_F_PLUS)  /* Do a sign (+/i) */
    signvalue = '+';
    else
      if (flags & DP_F_SPACE)
    signvalue = ' ';
  }

  if (flags & DP_F_UP) caps = 1; /* Should characters be upper case? */

  do {
    convert[place++] =
      (caps? "0123456789ABCDEF":"0123456789abcdef")
      [uvalue % (unsigned)base  ];
    uvalue = (uvalue / (unsigned)base );
  } while(uvalue && (place < 20));
  if (place == 20) place--;
  convert[place] = 0;

  zpadlen = max - place;
  spadlen = min - MAX (max, place) - (signvalue ? 1 : 0);
  if (zpadlen < 0) zpadlen = 0;
  if (spadlen < 0) spadlen = 0;
  if (flags & DP_F_ZERO)
  {
    zpadlen = MAX(zpadlen, spadlen);
    spadlen = 0;
  }
  if (flags & DP_F_MINUS)
    spadlen = -spadlen; /* Left Justifty */

  /* Spaces */
  while (spadlen > 0)
  {
    dopr_outch (buffer, currlen, maxlen, ' ');
    --spadlen;
  }

  /* Sign */
  if (signvalue)
    dopr_outch (buffer, currlen, maxlen, signvalue);

  /* Zeros */
  if (zpadlen > 0)
  {
    while (zpadlen > 0)
    {
      dopr_outch (buffer, currlen, maxlen, '0');
      --zpadlen;
    }
  }

  /* Digits */
  while (place > 0)
    dopr_outch (buffer, currlen, maxlen, convert[--place]);

  /* Left Justified spaces */
  while (spadlen < 0) {
    dopr_outch (buffer, currlen, maxlen, ' ');
    ++spadlen;
  }
}

#if 0
static LDOUBLE abs_val (LDOUBLE value)
{
  LDOUBLE result = value;

  if (value < 0)
    result = -value;

  return result;
}
#endif

static void dopr_outch (char *buffer, size_t *currlen, size_t maxlen, char c)
{
  if (*currlen < maxlen)
    buffer[(*currlen)++] = c;
}

#ifndef HAVE_VSNPRINTF
int vsnprintf (char *str, size_t count, const char *fmt, va_list args)
{
  str[0] = 0;
  dopr(str, count, fmt, args);
  return(strlen(str));
}
#endif /* !HAVE_VSNPRINTF */

#ifndef HAVE_SNPRINTF
/* VARARGS3 */
#ifdef HAVE_STDARGS
int snprintf (char *str,size_t count,const char *fmt,...)
#else
int snprintf (va_alist) va_dcl
#endif
{
#ifndef HAVE_STDARGS
  char *str;
  size_t count;
  char *fmt;
#endif
  VA_LOCAL_DECL;

  VA_START (fmt);
  VA_SHIFT (str, char *);
  VA_SHIFT (count, size_t );
  VA_SHIFT (fmt, char *);
  (void) vsnprintf(str, count, fmt, ap);
  VA_END;
  return(strlen(str));
}
#endif /* !HAVE_SNPRINTF */

#ifdef TEST_SNPRINTF
#ifndef LONG_STRING
#define LONG_STRING 1024
#endif
int main (void)
{
  char buf1[LONG_STRING];
  char buf2[LONG_STRING];
  char *fp_fmt[] = {
    "%-1.5f",
    "%1.5f",
    "%123.9f",
    "%10.5f",
    "% 10.5f",
    "%+22.9f",
    "%+4.9f",
    "%01.3f",
    "%4f",
    "%3.1f",
    "%3.2f",
    "%.0f",
    "%.1f",
    NULL
  };
  double fp_nums[] = { -1.5, 134.21, 91340.2, 341.1234, 0203.9, 0.96, 0.996,
    0.9996, 1.996, 4.136, 0};
  char *int_fmt[] = {
    "%-1.5d",
    "%1.5d",
    "%123.9d",
    "%5.5d",
    "%10.5d",
    "% 10.5d",
    "%+22.33d",
    "%01.3d",
    "%4d",
    NULL
  };
  long int_nums[] = { -1, 134, 91340, 341, 0203, 0};
  int x, y;
  int fail = 0;
  int num = 0;

  printf ("Testing snprintf format codes against system sprintf...\n");

  for (x = 0; fp_fmt[x] != NULL ; x++)
    for (y = 0; fp_nums[y] != 0 ; y++)
    {
      snprintf (buf1, sizeof (buf1), fp_fmt[x], fp_nums[y]);
      sprintf (buf2, fp_fmt[x], fp_nums[y]);
      if (strcmp (buf1, buf2))
      {
    printf("snprintf doesn't match Format: %s\n\tsnprintf = %s\n\tsprintf  = %s\n",
        fp_fmt[x], buf1, buf2);
    fail++;
      }
      num++;
    }

  for (x = 0; int_fmt[x] != NULL ; x++)
    for (y = 0; int_nums[y] != 0 ; y++)
    {
      snprintf (buf1, sizeof (buf1), int_fmt[x], int_nums[y]);
      sprintf (buf2, int_fmt[x], int_nums[y]);
      if (strcmp (buf1, buf2))
      {
    printf("snprintf doesn't match Format: %s\n\tsnprintf = %s\n\tsprintf  = %s\n",
        int_fmt[x], buf1, buf2);
    fail++;
      }
      num++;
    }
  printf ("%d tests failed out of %d.\n", fail, num);
}
#endif /* SNPRINTF_TEST */

void abort(void) {
    while (1);
}

#endif /* !HAVE_SNPRINTF */
/* Shut up the compaq compiler which hates empty files. This will
   never be linked anyway. */
